1 files changed, 120 insertions, 0 deletions
diff --git a/stmhal/modstm.c b/stmhal/modstm.c
new file mode 100644
index 000000000..5e72a75bb
--- /dev/null
+++ b/stmhal/modstm.c
@@ -0,0 +1,120 @@
+#include <stdio.h>
+#include <stdint.h>
+
+#include <stm32f4xx_hal.h>
+
+#include "nlr.h"
+#include "misc.h"
+#include "mpconfig.h"
+#include "qstr.h"
+#include "obj.h"
+#include "modstm.h"
+
+STATIC uint32_t get_read_addr(mp_obj_t addr_o, uint align) {
+    uint32_t addr = mp_obj_get_int(addr_o) & 0x7fffffff;
+    if (addr < 0x10000000) {
+        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "cannot read from address %08x", addr));
+    }
+    if ((addr & (align - 1)) != 0) {
+        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "address %08x is not aligned to %d bytes", addr, align));
+    }
+    return addr;
+}
+
+STATIC uint32_t get_write_addr(mp_obj_t addr_o, uint align) {
+    uint32_t addr = mp_obj_get_int(addr_o) & 0x7fffffff;
+    if (addr < 0x10000000) {
+        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "cannot write to address %08x", addr));
+    }
+    if ((addr & (align - 1)) != 0) {
+        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "address %08x is not aligned to %d bytes", addr, align));
+    }
+    return addr;
+}
+
+STATIC mp_obj_t stm_read8(mp_obj_t addr) {
+    uint32_t a = get_read_addr(addr, 1);
+    uint32_t v = *(uint8_t*)a;
+    return mp_obj_new_int(v);
+}
+
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(stm_read8_obj, stm_read8);
+
+STATIC mp_obj_t stm_read16(mp_obj_t addr) {
+    uint32_t a = get_read_addr(addr, 2);
+    uint32_t v = *(uint16_t*)a;
+    return mp_obj_new_int(v);
+}
+
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(stm_read16_obj, stm_read16);
+
+STATIC mp_obj_t stm_read32(mp_obj_t addr) {
+    uint32_t a = get_read_addr(addr, 4);
+    uint32_t v = *(uint32_t*)a;
+    return mp_obj_new_int(v);
+}
+
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(stm_read32_obj, stm_read32);
+
+STATIC mp_obj_t stm_write8(mp_obj_t addr, mp_obj_t val) {
+    uint32_t a = get_write_addr(addr, 1);
+    uint32_t v = mp_obj_get_int(val);
+    *(uint8_t*)a = v;
+    return mp_const_none;
+}
+
+STATIC MP_DEFINE_CONST_FUN_OBJ_2(stm_write8_obj, stm_write8);
+
+STATIC mp_obj_t stm_write16(mp_obj_t addr, mp_obj_t val) {
+    uint32_t a = get_write_addr(addr, 2);
+    uint32_t v = mp_obj_get_int(val);
+    *(uint16_t*)a = v;
+    return mp_const_none;
+}
+
+STATIC MP_DEFINE_CONST_FUN_OBJ_2(stm_write16_obj, stm_write16);
+
+STATIC mp_obj_t stm_write32(mp_obj_t addr, mp_obj_t val) {
+    uint32_t a = get_write_addr(addr, 4);
+    uint32_t v = mp_obj_get_int(val);
+    *(uint32_t*)a = v;
+    return mp_const_none;
+}
+
+STATIC MP_DEFINE_CONST_FUN_OBJ_2(stm_write32_obj, stm_write32);
+
+STATIC const mp_map_elem_t stm_module_globals_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_stm) },
+
+    { MP_OBJ_NEW_QSTR(MP_QSTR_read8), (mp_obj_t)&stm_read8_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_read16), (mp_obj_t)&stm_read16_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_read32), (mp_obj_t)&stm_read32_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_write8), (mp_obj_t)&stm_write8_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_write16), (mp_obj_t)&stm_write16_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_write32), (mp_obj_t)&stm_write32_obj },
+
+    { MP_OBJ_NEW_QSTR(MP_QSTR_GPIOA), MP_OBJ_NEW_SMALL_INT(GPIOA_BASE) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_GPIOB), MP_OBJ_NEW_SMALL_INT(GPIOB_BASE) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_GPIOC), MP_OBJ_NEW_SMALL_INT(GPIOC_BASE) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_GPIOD), MP_OBJ_NEW_SMALL_INT(GPIOD_BASE) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_GPIO_IDR), MP_OBJ_NEW_SMALL_INT(0x10) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_GPIO_BSRRL), MP_OBJ_NEW_SMALL_INT(0x18) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_GPIO_BSRRH), MP_OBJ_NEW_SMALL_INT(0x1a) },
+};
+
+STATIC const mp_obj_dict_t stm_module_globals = {
+    .base = {&mp_type_dict},
+    .map = {
+        .all_keys_are_qstrs = 1,
+        .table_is_fixed_array = 1,
+        .used = sizeof(stm_module_globals_table) / sizeof(mp_map_elem_t),
+        .alloc = sizeof(stm_module_globals_table) / sizeof(mp_map_elem_t),
+        .table = (mp_map_elem_t*)stm_module_globals_table,
+    },
+};
+
+const mp_obj_module_t stm_module = {
+    .base = { &mp_type_module },
+    .name = MP_QSTR_stm,
+    .globals = (mp_obj_dict_t*)&stm_module_globals,
+};